Shoot off both arms on a Hulk and then extract while it's alive.

Truly, you are the master of floodgates.

Complete a Stalker Hive tactical objective.

You have destroyed 20 poltergeist objects.

20 Taken have been drowned, electrocuted, or dispatched by some other indirect means.

You bought yourself some breathing time with a flare.

Be injured in all limbs at the same time.

50 Taken have felt your fury. Also, your flashbangs.

You managed a slow-motion dodge 20 times.

You have found 25 coffee thermoses.

You blasted four Taken into ashes with a single flashbang.

You have discovered 25 manuscript pages.